English verb conjugation
SHOULD BOX

Regular verb: box - boxed - boxed

Affirmation

Simple form	V-ing form
I'd box you'd box he'd box we'd box you'd box they'd box	I'd be boxing you'd be boxing he'd be boxing we'd be boxing you'd be boxing they'd be boxing
Perfect	V-ing perfect
I should've boxed you should've boxed he should've boxed we should've boxed you should've boxed they should've boxed	I should've been boxing you should've been boxing he should've been boxing we should've been boxing you should've been boxing they should've been boxing

Negation

Simple form	V-ing form
I shouldn't box you shouldn't box he shouldn't box we shouldn't box you shouldn't box they shouldn't box	I shouldn't be boxing you shouldn't be boxing he shouldn't be boxing we shouldn't be boxing you shouldn't be boxing they shouldn't be boxing
Perfect	V-ing perfect
I shouldn't have boxed you shouldn't have boxed he shouldn't have boxed we shouldn't have boxed you shouldn't have boxed they shouldn't have boxed	I shouldn't have been boxing you shouldn't have been boxing he shouldn't have been boxing we shouldn't have been boxing you shouldn't have been boxing they shouldn't have been boxing

Interrogative form

Simple form	V-ing form
should I box? should you box? should he box? should we box? should you box? should they box?	should I be boxing? should you be boxing? should he be boxing? should we be boxing? should you be boxing? should they be boxing?
Perfect	V-ing perfect
should I have boxed? should you have boxed? should he have boxed? should we have boxed? should you have boxed? should they have boxed?	should I have been boxing? should you have been boxing? should he have been boxing? should we have been boxing? should you have been boxing? should they have been boxing?

Interro-negative form

Simple form	V-ing form
shouldn't I box? shouldn't you box? shouldn't he box? shouldn't we box? shouldn't you box? shouldn't they box?	shouldn't I be boxing? shouldn't you be boxing? shouldn't he be boxing? shouldn't we be boxing? shouldn't you be boxing? shouldn't they be boxing?
Perfect	V-ing perfect
shouldn't I have boxed? shouldn't you have boxed? shouldn't he have boxed? shouldn't we have boxed? shouldn't you have boxed? shouldn't they have boxed?	shouldn't I have been boxing? shouldn't you have been boxing? shouldn't he have been boxing? shouldn't we have been boxing? shouldn't you have been boxing? shouldn't they have been boxing?